For the past 25 years, these volunteers have pulled nearly 440 tons of trash out of the Delaware River, but most commonly they'll pull out things like water bottles.

"In the beginning, Budwiser was king of the river. Now it's plastic water bottles," said Jones.

Volunteers said the amount of trash seems to dwindle each year, but they also said they never see the need for the cleanup going away.

"You can never get rid of all the littler. You can pick litter one day, and then go the next day and trust me, you're going to see that litter," said Carol Cummings of Pocono Pines.

Thanks to their efforts, more than 8,500 tires have been taken out, and 8,500 pounds of aluminum cans are gone, helping to keep the Delaware River clean for everyone, including the wildlife that calls it home.